Whatman 1004-125 Filter Circles, 125mm Dia, Grade 4, 100/pk (PN:1004-125)

Whatman Grade 4 filter paper is designed for fast filtration of coarse particles and gelatinous precipitates. Laboratories often use it for routine qualitative analysis, clarification of liquids, and sample preparation in chemical, environmental, and biological testing.

This filter paper typically provides particle retention of approximately 20–25 µm, making it suitable for capturing larger particles while maintaining a very high filtration speed.

Grade 4 filter papers are made from high-purity cellulose fibers derived from cotton linters, which provide good chemical compatibility and consistent filtration performance in laboratory applications.

Grade 4 is designed with larger pore sizes and high permeability, allowing liquids to pass through quickly. This makes it ideal for filtration tasks where speed is more important than retaining extremely fine particles.

The 125 mm diameter filter circles fit standard laboratory filtration funnels and gravity filtration setups. Their larger surface area helps process larger sample volumes efficiently during routine laboratory filtration procedures.